Frejus (anc. Forum Julii), a maritime town of S. France, in the department of Var, on an eminence overlooking the sea at the mouth of the Argens, 45 m. N. E. of Toulon; pop. in 1866, 2,887; with the suburb of St, Raphael, 3,050. It is the seat of a bishop and a commercial court, and has an episcopal seminary, a library, and a hospital. Its manufactures are corks, soap, oil, and wine. The town was founded by a colony from Massilia, and is supposed to have derived its name from Julius Caesar. Augustus made it a naval station, and kept there the ships taken at the battle of Actium. The ancient harbor is now entirely filled up by the deposits of the river, and the moles at its entrance are 3,000 ft. from the sea. Among the Roman remains are an aqueduct that can be traced more than 24 m. up the valley of the Siagnolle, an amphitheatre 650 ft. in circumference, a triumphal arch, and the pharos. Frejus was the birthplace of Julius Agricola and of the abbe Sieyes.